Hey, wait a second...I thought I was the only one that cussed...I have centered at 200 in the past, but use 100 most of the time. Only 1" difference between 100 and 200, should still be dead meat in my freezer.At 25 yards, I take three shots. Move scope. Take three shots, Cuss, I moved the wrong way, and now off paper. Reclabrate three shots. If I'm close to the center, I go 100 yards. I've never shot glass past100 yards.